Which of the following is not true of veins?
a) Their innermost layer is called the tunica intima.
b) Blood drains into them from venules.
C) They carry blood back to the heart.
1) They have a thicker tunica media than do arteries.

Matching: 1. first used by europeans as a local anesthetic; now abused for its euphoric effects 5 marijuana 2. found in coffee beans, tea leaves, and cocoa beans 2 heroin 3. prescribed for pain involving serious injury or surgery 1 morphine 4. illegal derivative of morphine that is sold on the street as a white powder 6 caffeine 5. can evoke feelings of terror and panic 4 lsd 6. causes user to experience a conscious dreamlike state 3 cocaine